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See NF rule 4-9 Boundary lines:
The inside edges of these lines define the inbounds and out-of-bounds areas.
Also see Rule 1-2:
The sidelines and end lines shall be a minimum of 2 inches in width.
Notice that it says "minimum." The lines can be 10", 20" or even more in thickness. Given that the location of the outside edge is variable from gym to gym, it follows that that edge does not mean anything. You would not require the thrower to stay 5' OOB (for a 5' thick line) on the throwin in only some gyms.
A thrower, as others have said, is OOB as required if they are not touching inbounds and are either touching OOB or in the air last having last touched OOB.
(Side note: if they jump on a designated spot throw-in, at least one foot must remain in the space over the spot: bounded by the OOB line on the front, the wall/bleachers on the back, and is 3 feet wide).
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